Chart of birth control methods - Chance of pregnancy during first year of use

About 222 million women who want to avoid pregnancy in developing countries are not using a modern birth control method. Birth control use in developing countries has decreased the number of deaths during or around the time of pregnancy by 40% (about 270,000 deaths prevented in 2008) and could prevent 70% if the full demand for birth control were met.[17][18] By lengthening the time between pregnancies, birth control can improve adult women's delivery outcomes and the survival of their children.[17] In the developing world women's earnings, assets, weight, and their children's schooling and health all improve with greater access to birth control.[19] Birth control increases economic growth because of fewer dependent children, more women participating in the workforce, and less use of scarce resources.[19][20]

Reference 1: Typical use and Perfect use.

Reference 2: No birth control, Combination pill, Progestin-only pill, Sterilization (female), Sterilization (male), Condom (female), Condom (male), Copper IUD, Hormonal IUD, Patch, Vaginal ring, Depo-Provera, Implant, Diaphragm and spermicide, Fertility awareness, Withdrawal and Lactational amenorrhea method (6 months failure rate).

Source: http://en.wikipedia.org/wiki/Contraception